I don't have any YP (yet!).
I think the YP people that do seasonal spawning structure place some tall, narrow tree cuttings in the water propped off of the bottom a little bit.
I believe the YP like to "drape" their egg masses over the structure - like you hang a towel on your towel rack.
Maybe post a YP spawning structure question as a new thread, since I am not knowledgeable enough to give you good advice. I would like to hear you got some successful spawning in your pond, since I think that would be a big benefit to your long-term goals.
